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Why is Li Yongle's math video missing?

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Li Yongle, 1983 was born in Jilin City, Jilin Province. He is a high school math physics teacher, an exclusive creator of watermelon video, a double bachelor of physical economics in Peking University, and a master of electronic engineering in Tsinghua University.

A series of popular science videos produced by Teacher Li Yongle and jointly produced by Watermelon Video and Popular Science China have spread all over the Internet, and CCTV News and People's Daily have forwarded them to like them.

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